<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model.trim="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model.number="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="gender">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="fn">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in list" :key="item.id">
          <td>{{ item.id }}</td>
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.gender }}</td>
          <td>
            <button @click="del(index)">删除</button>
            <button @click="edit(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
    <div>当前处于{{ editMode ? "编辑" : "添加" }}模式</div>
    <div v-if="editMode">正在编辑序号为{{ list[current].id }}的学生的信息</div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      name: "",
      age: 0,
      gender: "",
      list: [],
      current: 0,
      editMode: false,
    };
  },
  methods: {
    fn() {
      if (
        this.name == "" ||
        this.age <= 0 ||
        typeof this.age != "number" ||
        this.gender == ""
      ) {
        alert("Invalid Input!");
        return;
      }
      //   let r = this.list.findIndex((item) => item.id == this.id);
      if (this.editMode == false) {
        this.list.push({
          id: this.list.length > 0 ? this.list[this.list.length - 1].id + 1 : 1,
          name: this.name,
          age: this.age,
          gender: this.gender,
        });
        return;
      }
      this.list[this.current].name = this.name;
      this.list[this.current].age = this.age;
      this.list[this.current].gender = this.gender;
      this.editMode = false;
    },
    del(index) {
      this.editMode = false;
      this.list.splice(index, 1);
    },
    edit(index) {
      this.editMode = true;
      this.current = index;
      this.name = this.list[index].name;
      this.age = this.list[index].age;
      this.gender = this.list[index].gender;
    },
  },
};
</script>